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/*
* Setting up the clock on MSP SOCs. No RTC typically.
*
* Carsten Langgaard, carstenl@mips.com
* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
*
* ########################################################################
*
* This program is free software; you can distribute it and/or modify it
* under the terms of the GNU General Public License (Version 2) as
* published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* ########################################################################
*/
#include <linux/init.h>
#include <linux/kernel_stat.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/ptrace.h>
#include <asm/mipsregs.h>
#include <asm/time.h>
#include <msp_prom.h>
#include <msp_int.h>
#include <msp_regs.h>
void __init plat_time_init(void)
{
char *endp, *s;
unsigned long cpu_rate = 0;
if (cpu_rate == 0) {
s = prom_getenv("clkfreqhz");
cpu_rate = simple_strtoul(s, &endp, 10);
if (endp != NULL && *endp != 0) {
printk(KERN_ERR
"Clock rate in Hz parse error: %s\n", s);
cpu_rate = 0;
}
}
if (cpu_rate == 0) {
s = prom_getenv("clkfreq");
cpu_rate = 1000 * simple_strtoul(s, &endp, 10);
if (endp != NULL && *endp != 0) {
printk(KERN_ERR
"Clock rate in MHz parse error: %s\n", s);
cpu_rate = 0;
}
}
if (cpu_rate == 0) {
#if defined(CONFIG_PMC_MSP7120_EVAL) \
|| defined(CONFIG_PMC_MSP7120_GW)
cpu_rate = 400000000;
#elif defined(CONFIG_PMC_MSP7120_FPGA)
cpu_rate = 25000000;
#else
cpu_rate = 150000000;
#endif
printk(KERN_ERR
"Failed to determine CPU clock rate, "
"assuming %ld hz ...\n", cpu_rate);
}
printk(KERN_WARNING "Clock rate set to %ld\n", cpu_rate);
/* timer frequency is 1/2 clock rate */
mips_hpt_frequency = cpu_rate/2;
}
void __init plat_timer_setup(struct irqaction *irq)
{
#ifdef CONFIG_IRQ_MSP_CIC
/* we are using the vpe0 counter for timer interrupts */
setup_irq(MSP_INT_VPE0_TIMER, irq);
#endif
}
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